Vehicle brake



may 13, 1924. 1,493,910

J. VILLIGER 51615 BRAKE iled Aug. G 1923 JSEPE VLLIGER, 0F DIXON, LLNIS.

VEHGLE BRAKE.

Application filed August e, 1923. Serial No. 655,969.

To all whom it may concern Be it knownthat I, .lossen Vinatieri, a citizenot the United States, residing at Dixon. in the county of Lee and State of lllinois, have invented certain nenv and useful Improvements in Vehicle Brakcs,of which thefollowing is a specification.

This invention relates to brakes which are used on motor cars and provided with pivoted expansion members; and it consists in the novel construction and combination of the parts hereinafter fully described and claimed 1vliereby the expansion members are expanded in such a way as to prevent the brake cylinders from belng worn away unevenly. ,When a cam is used to force the ends of the expansion member into engage- `ment with the'brake drum, ar l the cani bears directly on the said ends, oneend is forcedv outwardly and the other end is 'torced in- Wardly of the center of the brake drum. When the parts stand in the positions shown in Fig. 1, and the cam is turned clockwise, and lugs or wear plates are provided be tween the ends of the ex ansion member and the cam,4and the said ugs or Wear plates are 'supported as shown, the ends of the expension member are forced apart. on lines substantially at a right. angle to the parallel acesof the lugs or wear lates against which the cam bears. lf the liigs or wear plates were not provided, the right hand end of the expansion' member would be forced downwardly, and the lefthand end upwardly, on lines diagonal of the faces against which the cam would bear. l

ln the drawings, Figure 1 is a front'view of a brake constructed according to this in# vention, and showing the brake cylinder m section. Fig. 2 is a cross-section through the. brake, taken on the line .2-2 in Fig. l. Figs. 3, 4 and 5 are front views of expansion meml bers and expansion levers similar to those 'shown in Fig. 1, but showingr various modifipart is rovided ivitli a socket 14 which engages with-a supporting pin or projection 15 on the carrier l0. The free ends of the expension member are provided with lugs 16 arranged substantially parallel to each other and' affording Wearing surfaces ot large area. A cam ll'is sceure'don a shaft it? which jonrnaled in a bearing 20 on the carrier l0,

(lll

and is provided v'ith a handle 2l or other convenientmeans for operating it; i

The cam lf3 is arranged 'between the lugs 16, and is turned so as to expand the expanm sion member. 'lVhen the cam is arranged to bear directly on the lags i6, as in brakes ordinarily constructed, it thrusts the lags apart in an unsatisfactory manner.. and causes the brake cylinder and expansion member to wear unevenly and badly. In order to over come this defect., expansion levers Q5 are pron vided and are also supported by the carrier. In the form of the device shown in Fig. l, theseleversl have forked ends 26 which are pivoted b v pins 27 to .lugs 28 formed on vthe expansion member 12 adjacent to the socket 14. The other ends ot the levers 25 are provided with lugs 29 which are arranged between the lugs 'lli of the expansion member and the cam i8. lWhen the cam is moved so asito expand the expansion niembcr into engagement with the brake cylinder, the unequal pressure and unequal Wear all falls on the inner sides of the lugs 29' which are in contar-tl with the cam, and the outer sides of the lugs'fl bear on the lugs '16 with Vuniform pressure over their surfaces, and

the uneven weer between the expansion member and the brake cylinder is prevented.

The expansion levers have a helical spring f5() secured between their pivoted endportions to hold the lugs Q9 in contact with the cam, but. this spring may be dispensed with, if desired.

The expansion member l2 preferably has a" helical spring secured to lugs 33 on its freeend portions, and operating to normally hold it ont of4 engagement with the brake cylinder, but this spring may be dispensed with, if desired. in some. instances. v

Holes ,234 are formed in the expansion levers for the passage of the straight end portions of the spring 82, and the lugs '33 have guides or enlargements 35 on their end portions which T.vork in the. holes 34, and prevent the free end portions of the expansion levers from being displaced laterally. Notches 36 are also formed in the projecting portions of the expansion levers below `the lugs 29, so as to clear the spring 32,

. "In the modification shown in Fig. 3, the expansion levers 45 are 'relatively short, and they are pivoted to the carrier by pms 4c',

Y instead of heilig pivoted to the expansion oi'ed to the carrier by a single pin 5T.

member. pressed on the cam by a pin 49 and springs 50, arranged near their lugs 29, instead of by a single spring 30 as shown in Fig. 1. The expansion member vis'vshoivn made in twoparts l2.

In the modification shovvn in Fig. 4, the expansion levers 55 are 'longer than the levers 45..:1nd they haveieurved portions which .extend around the axle. 'and are pi 'f- In this form of the device two pivot pins may be used for the expansion levers similar to the pins 47 showny in Fig. 3, if desired.

In the modification shown in Fig. 5, the expansion levers are differently shaped from those shown in the other4 figures. These levers have pivotpins', QT similar' to `those slionirin Fig. l. amlthey are pivoted t0 the expansion member; and they have al pin 49 and helical springs 5U for pressing them on l'hecam, similar to those shownin Fig. 3.

That I claim is: 1

l. In a'brake, n revoluble brake cylinder, a stationary "carrier, un expansion member supported by the carrier, pivoted.expansion levers also supported by the earrier and arranged inside the expansiony member and provided with lugs which bear on its ends,

and an operating cam journaled in thecar` rier and arranged hetwee'nrhe lugs of the expansion levers and operating to expand The expansion levers 45 are the expansion member into engagement with the periphery of the brake cylinder.

2. In a brake, a .revoluble brake cylinder, a stationary carrier, an expansion member, a pin connecting the middle part of the expansion member with the carrier, expansion levers pivoied-to the ex ansion member adjacent to the said pin an 4provided with lugs which beur on the ends of the vexpansion member, and an operating cam ]ournaled in the carrier and engaging with the said lugs.

3. A brake as set forth in claim l, and having the lugs of the expansion levers held against the cam by spring pressure.

LA brake as set forth in claim 1, and having the expansion member normally held elear of the vbrake cylinder by spring pres'- sure. f

5. In a brake, arevoluble brake cylinder, a stationary carrier, un expansion member Supported by the earrier and having guide lugs near its ends, expansion levers also supported bythe carrier and provided with.

lugs which bear on the ends of the expansion member, said levers having also holes in their end .portions which engage with the said guide lugs, a spring having its end portions sec'ured to the said guide lugs and operating to normally hohl the expansion member clear of the brake cylinder, and an operating fam journaled in the carrier and arranged between the lugs of the expansion levers.

In testimony whereof I have atixed my signature.

JOSEPH Vl LLHER. 

